玉米秸秆纤维/聚乳酸复合材料的力学及降解性能研究

利用热压工艺制备得到了玉米秸秆纤维/聚乳酸复合材料,研究了玉米秸秆纤维的含量对复合材料力学及降解性能的影响。研究表明：随着玉米秸秆纤维含量的增加,复合材料的力学性能（拉伸强度、断裂伸长率）出现先增大后减小的变化趋势,在玉米秸秆纤维含量为10%时复合材料的断裂伸长率达到20.3%,复合材料的拉伸强度在玉米秸秆纤维含量13%时达到最大值24.38MPa;在降解120 d后,玉米秸秆纤维/聚乳酸复合材料的质量损失率变大,同时随着玉米秸秆纤维含量的增加,复合材料的质量损失逐渐变大,聚乳酸分子量的降低速度加快。

Mechanical properties and degradation characteristics of corn straw fibers/polylactic acid composite materials

The corn stalk fiber/polylactic acid(PLA) composite material was prepared by hot pressing process, and the effect of corn stalk fiber content on the mechanical properties and the degradation performance of the composite material was studied. The results showed that the mechanical properties(tensile strength, elongation at break) of the composites increased first and then decreased with the increase of the fiber content of the corn stalk. When the content of corn stalk fiber was 10%, the elongation ratio of break reached 20.3%. The tensile strength of the composite reached 24.38 MPa when the content of corn stalk fiber was 13%. After 120 days of degradation, the tensile strength of corn stalk fiber/degradation rate of polylactic acid composites became larger. At the same time, with the increase of corn stalk fiber content, mass loss of composites became larger and PLA molecular weight decreased faster.